Perforating mechanism



July 12, 1949. $M|TH 2,475,807

PERFORAT ING MECHANI SM Filed March 1, 1947 2 Sheets-Sheet 1 July 12, 1949. A. SMITH 2,475,807

PEBFORATING MECHANISM Filed March 1, 1947 2 Sheets-Sheet 2 Patented July 12, 1949 UNITED STATES PATENT OFFICE PERFORATING MECHANISM August Smith, Newport, Ky.

Application March 1, 1947, Serial No. 731,835

3 Claims.

This invention relates to perforating mechanisms, and particularly to those devices designed to cut semi-heavy paper stock. The machine here disclosed is specifically directed to the forming of elongated slots in materials used for the manufacture of clothing patterns.

t is the practice of mens clothing manufacturers to cut fabrics by modeling the cloth from patterns made of a semi-heavy paper. These patterns are produced in conventional sizes and are designed to satisfy certain specific measurements. In addition, there may be modeled, from these patterns, clothing, the measurements of which do not meet the dimensions of conventional sizes. This is accomplished by providing an elongated perforation in the body of the pattern, and by printing a graduated scale along the bordering edges of the perforation.

Heretofore, the perforating operation in the manufacture of clothing patterns has been performed with the aid of such tools as a die, a wooden block and mallet. The employment of such tools for cutting heavy paper stock has proven exceedingly difficult, therefore, an object of the invention is to efficiently direct a perforators energy by the utilization of mechanical power in combination with a novel cutting device.

Another object of the invention is to eliminate the tendency of paper and like materials to gather into folds, or to bunch, when being cut during a paper slotting operation.

Another object of the invention is to provide a means, following a paper slotting operation, to eject the cut out blank in preparation for succeeding operations.

A further object, is to produce a sheet perforating mechanism which is simple and durable in construction, one that requires a comparatively small amount of motive power to operate, the

latter being a requisite in a device where large shearing force is necessary to perform the operation demanded.

Further objects and advantages are within the scope of this invention such as relate to the arrangement, operation, and function of the related elements of the structure as are described in the following specification and the illustrated drawings, in which:

Figure 1 is a side elevational View showing my perforating mechanism with the knife blades held in a raised position.

Figure 2 is a top plan view of the mechanism with the longitudinal extension of the base broken away.

Figure 3 is a front elevational view of the device with the actuating lever and base partly broken away.

Figure 4 is asectional view taken on line 44 of Figure 1, differing however from Figure 1 in that the device is in a cutting position, and

Figure 5 is a sectional view taken on line 5-5 of Figure 2, differing however from this view by the cutting position of the device.

The invention as disclosed in the accompanying drawings broadly includes a manually operable press ll having a base l2 that presents a flat surface I3 for the support of paper and like sheet materials M to be operated on. Mounted on the press is a pair of opposed die members it and 16, one of which is in a fixed position on the base of the press, the other beng disposed on the actuating means I! of the press. The cutting means E8 of the die members l5 and It are so arranged, that upon reciprocation of the means H, the sheet material I4, positioned intermediate the die members, will be perforated by a co-ordinated shearing action of the cutting means 18.

Referring specifically to the structure of my perforating mechanism, the press I l comprises a rectangular base l2, which includes the paper supporting surface l3. The longitudinal sides 20 and 2| of the base are extended to provide a pair of depending legs 22 and 23. A recess 24 is located in the supporting surface I3 of the base I at a position adjacent the front longitudinal side 20, in which a die block 25 is secured by bolts 26. This recessed die block 25 presents an exposed face 21 that lies in the same plane as the face l3, and thereby forms a continuation of the paper supporting surface I3 of the base.

Finally, a standard 28 is mounted to the base l2 adjacent the rear longitudinal side 2! by means of bolts 29.

The standard 28 has an upright member 30, which is held perpendicular with respect to the paper supporting surface !3 and in central alignment with the die block 25. The standard further includes a rectangular cross head 3i, which is rigidly projected over the exposed face 2?, in a spaced relationship therewith, and by means of an extended arm 32 that juts from the standard 28.

A movable die head 33 is positioned intermediate the exposed face 21 of the stationary die block 25 and the cross head ST, and in this opposed relation to the die block, the die head 33 is adapted for guided perpendicular reciprocation relative to the exposed face 21. To obtain this movement, I provide a pair of spaced slide bars 34 and 35 that are guided by the cross head 3:

through bores 36 and 31 provided therethrough, and by fixing the respective terminals of these bars by means of pins 38 to the die head 33 and to a cross bar 39 disposed above the cross head 3|. The upward movement or stroke of the die head 33 is impelled by helical springs 40 mounted about the slide bars 34 and 35 so that their resiliency urges the die head 33 away from the die block 25. The downward movement or stroke of the die head 33 is actuated by a manually o'perg able lever 4| pivoted to the upright member 30 of the standard by a pin 42, and by the extended portion of the lever bearing upon the cross bar 39. A downward movement of the lever 4| by an operator, since the cross bar 39 is in the path of travel of its extended portion, will there= fore actuate the die head 33 towards the stationary die block 25.

For purposes of perforating an aperture in the sheet material l4 disposed on the paper supporting surface I3 of the base, and to firmly secure the cutting means l8 to the die head 33, there is provided a marginal shoulder 43 formed by an offset surface 44 in the opposed sides of the die head. The edges 45 of the surface 44 substantially describe in outline the elongated rectangular slot to be cut in the clothin pattern I4. Two pairs of opposed knife blades 46 are secured to this surface 44 by bolts 41, and are thereby co-related to form the edges of the slot to be cut. H

The opposed depending blades 46 consist of an inner and an outer major face 48 and 49 respectively, and transverse end faces 50. The ends 59 of the blades that are mounted to the langitudinal sides of the die head 33 are in abutment with the inner face 48 of the blades mounted to the transverse sides of the die head. Each blade has a beveled surface on its relatively inner face 48, which forms a cutting edge 52 in the plane of the outer face 49. Each cutting edge 52 of the blades'has a relatively obtuse salient point 53 positioned intermediate its ends 50. There is thereby formed on each blade a pair of oppositely inclined shearing edges 54 and 55 that are disposed in the common plane of the outer face 49 of the knife blades.

To further facilitate the perforating action of the knife blades of my device, there is formed in the body of the stationary die block a continuous groove 56 in alignment with the depending knife blades 46 for blade reception on the down stroke of the die head 33. The groove is extended perpendicularly to the exposed face 21 of the die block, and has a relatively outer face 51 that describes a cutting edge 58 with this exposed face. A shearing action by the cutting edges 52 and 58 is obtained upon the paper M by the outer face 51 of the groove lying substantially in the plane of the outer face 49 of the knife blades.

A statibnary stripper plate 59 is disposed-intermediate the die members! 5 and I6 for ejecting the paper blanks following the perforating operation. The plate is held in spaced relation to the die block 25 by spaced guide pins 60 that are rigidly secured to the cross head 3|. These pins may also serve as guides for the die head 33. The outline of the stripper plate 59 is substantially similar to that presented by the interior major faces 48 of the opposing knife blades '46, but-are of a somewhat lesser dimension to allow' clearance for the blades in their movement relative to the die block 25.

It is apparent from'the drawings and the above 4 description, that a semi-heavy paper stock may be positioned between the stripper plate and the paper supporting surface of the base, and also evident that the cutting edges of the respective die members will provide an efiicient shearing action for the perforating of clothing patterns.

What is claimed is:

1. In a paper perforating device, a base having a supporting surface for paper, a die block having an exposed face that forms a continuation of the supporting surface of the base, a rigid cross head mounted to the base and projected over said die block in spaced relation to the exposed face thereof, depending guide pins rigidly mounted to said cross head, a stationary stripper plate fixed to said pins and disposed above the die block in spaced relation thereto, a reciprocable die head mounted intermediate the stripper plate and cross head for guided movement by said pins perpendicular to said exposed face, a cross bar disposed above the cross head, spaced slide bars mounted for guided movement in said cross head and having their terminals fixed to said die head and cross bar, resilient means yieldingly supporting the cross bar away from the die block, a lever pivoted to the base fer actuating the cross bar, opposed knife blades secured to the reciprocable die head and ctr-related to form the edges of the perforation to be out, each blade being beveled on its inner face to form a cutting edge in the plane or the outer face of the blades, each cutting edge presenting a relatively obtuse salient point intermediate its ends and forming thereby a pair of oppositely inclined shearing edges disposed in the common plane of the outer face of the blades, a continuous groove formed in the die block perpendicular to the exposed face thereof, a relatively outer face formed by said groove, a cutting edge 'defined by the outer face and the exposed face of the die block, the outlines of which describes the contour of the perforation to be cut in paper disposed on the supporting surface of the base, said outer face of the-groove lying substantially in the plane of the outer face of the knife blade.

2. In a paper p'erforat-ing'device, a base having a supporting surface for papena die block having an exposed face that forms a continuation of the supporting surface of theb'ase, a rigid "c' r'o'ss head mounted to the base 'a'nd'prbjecte'd over said-die block in spaced'relation to theexposed face thereof, depending guide pins rigidly mounted to said cross head, a stationary stripper plate fixed to said pins and disposed above the die block in spaced relation thereto, a reciprocable "the head mounted intermediate the stripper plate and cross head for guided movement by said'pin's erpendicular to said exposed face, across bar disposed above the cross head, spaced slide bars mounted for guided movement in said cross head andhavi'n'g their terminals fixed to said die head and cross bar, resilient means yieldingl'y supporting the cross bar away from the die blbc'k, alever pivoted to the base for actuating the cross bar, opposed knife blades secured to the reciprocable die head and co-related to'f'orm the edges of the perforation to be cut, a continuous groove formed in the die block perpendicular to the exposed face thereof, a relatively outer face formed by said groove, a cutting edge'defined by the outer face and the exposed face of the die block, the outlines of which describes the contour of the perforation to be cut in paper disposed on the '75 supporting surfaceof the base,-said outer face'of the groove lying substantially in the plane of the outer face of the knife blade.

3. In a paper perforating device, a base having a supporting surface for paper, a die block mounted in the base and having a face that forms a continuation of the paper supporting surface, said die block having two intersecting pairs of grooves formed through its upper portion, a rigid cross head mounted upon the base and disposed above the die block, depending guide pins fixed to said cross head, a stationary stripper plate fixed to the lower ends of the pins and disposed above the die block in spaced relation, a reciprocable die head mounted intermediate the stripper plate and the cross head for guided movement by said pins, a cross bar disposed above the cross head, spaced bars mounted for guided movement in the cross head and having their upper ends fixed to the cross bar and their lower ends fixed to the die block, resilient means for yieldingly supporting the cross bar upon the cross head, a lever pivoted to the base for actuating the cross bar, and opposed knife blades secured to the die head The following reierenices are of record in the file of this patent:

UNITED STATES PATENTS 10 Number Name Date 13,920 Rice Dec. 11, 1855 59,944 Barton Nov. 27, 1866 77,294 Knapp Apr. 28, 1868 123,690 Gatchell Feb. 13, 1872 15 1,913,119 Joachimczyk June 6, 1933 2,253,259 Wilson Aug. 19, 1941 2,412,066 Shear Dec. 3, 1946 FOREIGN PATENTS 20 Number Country Date 12,826 Norway Apr. 5, 1904 851,760 France Jan. 15, 1940 

